SOLIDWORKS 2015 server product alert: SOLIDWORKS server products including SOLIDWORKS License Manager and SOLIDWORKS EPDM will not install on Windows Server 2008 operating systems. This was announced in the 2014 SOLIDWORKS release notes. If you are looking to upgrade your server machines it is recommended to go with Windows Server 2012.
Below is copied from the 2014 release notes.
SOLIDWORKS Server Products – The SOLIDWORKS 2015 and Enterprise PDM 2015 server products, including the Network License Server, will not install on the Windows Server 2008® operating system.